WE WERE DRIVING THROUGH A NEW NEIGHBORHOOD THAT WAS STILL UNDEVELOPED. THE PASSENGER SIDE IMPACT AIRBAGS DEPLOYED WHEN I HIT A RAISED SEWER DRAIN WITH MY FOOT ON THE BRAKE. I WOULD ESTIMATE APPROX. SPEED OF 10MPH. THE SIDE AIRBAG DEPLOYED AND HIT MY WIFE IN HER HEAD AND ARM. SHE INCURRED A HEADACHE AND BRUISE ON HER RIGHT ARM. THE INCIDENT FILLED THE VEHICLE WITH THE AIRBAG DUST AND I IMMEDIATELY PULLED OVER AS MY WIFE WAS SCREAMING AND CRYING IN PAIN. I CANNOT UNDERSTAND WHY THE PASSENGER SIDE AIRBAG DEPLOYED AT SUCH A LOW RATE OF SPEED AND WITH IMPACT ONLY TO THE UNDERSIDE OF THE VEHICLE, WHICH CAUSED DAMAGE TO THE INSIDE OF THE CAR PILLARS AND INJURY TO MY WIFE. *TR